Surface-cooler.



No. 788,771. PATENTED MAYZ, 1905. W. HOHBACH.

SURFACE COOLER.

APPLICATION FILED OUT. 31,1904.

NTTED STATES 12cm peauea'ea 2, 19u5.

PATENT OFFICE.

WILHELM HOHBAOH, OF ULM, GERMANY, ASSIGNOR TO THE FIRM OF NEUEGASINDUSTRIE, ULM, G. M. B. H., OF ULM, GERMANY.

SURFACE-COOLER.

SPECIFICATION forming part of Letters Patent No. 788,771, dated May 2,1905.

Application filed October 31, 1904. Serial No. 230,789.

V at Ulm-on-the-Danube, Kingdom of Wiirtexrr berg, in the Empire ofGermany, have invented a new and useful Surface-Cooler, of which thefollowing is a specification.

My invention relates to improvements in surface-coolers, either forstationary plants or for vehicles or the like such as, for instance,automobiles and autotrucks-of that kind in which between a reservoir forwarm liquid and a reservoir for cooled liquid a series of cooling-platesin pairs is inserted and so arranged as to form a plurality of narrowpassages for the liquid to be cooled by the contact of the externalplate-surfaces with a stream of air.

, The objects of my improvement are, first, to provide the two plates ofeach pair with a plurality of cross channels and projections oftriangular cross-section which alternate on each plate and correspond tothose of the other plate, so that a narrow zigzag channel in thelongitudinal direction is formed between the two plates; second, toprovide the two plates of each pair with a plurality of bossesbetween'the cross channels and projections, which bosses on either platerest on plain parts of the other plate and serve as distancepieces;third, to provide the two plates of each pair with a longitudinalprojection along either edge, which projection rests on the other plateand serves as a distance-piece, and, fourth, to close the edge spacesbetween the two plates of each pair by means of solder.

The surface-coolers according to my invention present severaladvantages: First, they can be produced quickly and cheaply; second,they can be so arranged as to form a plurality of comparatively narrowcross-channels through which the air can be passed or sucked or forcedin order to take up as much heat as possible from the liquid, and thusto cool the latter most efiectively, and, third, a comparatively smallquantity of liquid will do for the respective purpose, since it can beconstantly cooled.

I will now proceed to describe my invention with reference to theaccompanying drawings, in which Figure 1 is a vertical cross-section onthe line C 1) in Fig. 2 through a cooler, a part of the upper reservoirfor the warm liquid and a part of the lower reservoir for the cooledliquid, the second element (counting from left) of the cooler properbeing alone filled with liquid. Fig. 2 is a longitudinal section throughthe line E F in Fig. 1, and Fig. 3 is a horizontal section through theline A B in Figs. 1 and 2.

Similar letters of reference refer to similar parts throughout theseveral views.

As is clearly shown in the drawings, each plate a of sheet metal is sopressed or stamped in suitable machine-tools as to receive on the oneface a plurality of parallel cross channels ff and projections r g,alternating one with the other, a plurality of bosses b I) in the plainparts between the channels ff and pro jections g g, and on the otherface a longitudinal channel 0 along the one edge. The crosschannelsf'fand projections g r are preferably made triangular incross-section. Each channel f on the one face of the plate (0 appears asa projection on the other face, and each projection g on the former faceappears as a channel f on the latter face. Two plates (1 a are so placedon each other that the projections g g of the one plate a engage in thechannels ff of the other plate a, and vice versa, and that theprojection forming the other face of the channel a of the one plate a,

bears on that edge of the other plate a which is left without a channelr;-that is to say, the channel 0 of the one plate a is on the left andthat of the other plate a is on the right. (See Figs. 2 and 3.) Therebya narrow zigzag channel of a nearly uniform thickness is formed betweenthe two plates (.0 a in their longitudinal direction. The bosses Z) Z)of either plate a bear on plain parts of the other plate a and serve asdistance-pieces. Each plate is sulficiently stiffened in the crossdirection by the cross projections g g on both faces and will thereforenot bend under the action of the head of the liquid. For connecting thetwo plates at a the two edge spaces 2 2 (see Fig. 3) are preferablyfilled up with solder, whereby also the passage k is closed on bothsides. Thus an element of the surface-cooler is produced. Severalelements so formed are connected at their ends to a reservoir (Z forwarm liquid and to a reservoir 0 for cooled liquid in any known andapproved manner. For example, the respective plates 7c and Z of the tworeservoirs may be provided with several parallel lengthy openings intowhich the ends of the cooler parts are introduced and in which they aresecured by soldering. Preferably the several cooler parts are sodisposed that the projections of either part touch those of the oppositepart, as is clearly shown at Fig. 1. Then a plurality of cross-channelsm m are formed between the several cooler parts, and through thesechannels m m the air is passed for cooling the surfaces of the plates aa. As will be seen from Fig. 1, these cross-channels m m arecomparatively narrow, so that the air passing through them can beutilized to the utmost for cooling the surfaces of the plates (4 a.

The surface-cooler may serve various purposes, according to thecircumstances, and will require to be adapted to the respective machineparts, devices, and so on. It is immaterial of what construction the tworeservoirs (Z and c are and in what manner the liquid is supplied to theone, (Z, and discharged from the other, e. In all cases the liquidpassing through the surface-cooler is divided into several very thinstreams, which during their passage through the cooler parts areconstantly baffled and deflected in the zigzag passages ]L It, so thatevery particle of the liquid is subjected to the cooling effect of theplates a a. The air passing through the several cross-channels m m istherein conducted and obliged to take up the heat from the surfaces ofthe plates (0 a. Preferably the air is sucked or forced through theseveral channels or m in any known and approved manner in order toincrease its cooling effect.

When employed in automobiles or autotrucks, the parts of thesurface-cooler are made of a convenient length and breadth and inclosedin a suitable space between the upper reservoir (Z for warm water andthe lower reservoir 6 for cooled water. On the one side of the spaceforexample, on the left or on the right in Fig. 2a fan or the like isdisposed in a well-known manner and arranged to be driven from themotor, so that it will suck or force (as the case may be) the airthrough the cross-channels m m.

The surface-cooler may be varied in many respects without deviating fromthe spirit of my invention. The bosses Z) .7), which are shown ascircular, may have any other shape, or they may be replaced bydistance-pieces proper. The sharp edges of the cross projections g 9 maybe a little rounded off.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a surface-cooler, the combination with two plates of sheet metaleach sopressed or stamped as to form a plurality of cross channels andprojections of triangular cross-section which alternate one with theother and leave between them plain parallel parts, of means for keepingsaid two plates at a small distance apart and closing their edges,whereby a narrow zigzag channel is formed for the liquid passinglongitudinally from the reservoir for warm liquid to the reservoir forcooled liquid.

2. In asurface-cooler, the combination with two reservoirs, one for warmliquid and one for cooled liquid, of two plates of sheet metal each sopressed or stamped as to receive a plurality of cross channels andprojections of triangular cross-section alternating one with the otherand a projection along the one edge, which rests on the opposite edge ofthe other plate, plain parallel parts being left between the crosschannels and projections, the two plates being so placed on each otherand connected at the ends with said two reservoirs, that a narrow zigzagchannel of nearly uniform thickness is formed for the liquid passingthrough, and solder filling up the edge spaces of said two plates, theexternal faces of said two plates being subjected to the cooling effectof air.

3. In asurface-cooler, the combination with two reservoirs, one for warmliquid and one for cooled liquid, of a plurality of pairs of plates ofsheet metal, each plate being so pressed or stamped as to receive aplurality of cross channels and projections of triangular cross-sectionalternating one with the other and a projection along the one edge,which rests on the opposite edge of the other plate and leaves anexternal space to be filled up with solder, plain parallel parts beingleft between the cross channels and projections, the two plates of eachpair leaving between them a narrow zigzag channel of nearly uniformthickness and being connected at the ends with said two reservoirs, theseveral pairs touching each other with their projections and formingbetween them a plurality of crosspassages for the cooling-air.

4. In a surface-cooler, the combination with two reservoirs, one forwarm liquid and one for cooled liquid, of a plurality of pairs of platesof sheet metal, each plate being so pressed or stamped as to receive aplurality of cross channels and projections of triangular cross-sectionwhich alternate due with the other and leave between them plain parallelparts, a plurality of bosses in the plain parts between the channels andprojections and a projection along the one edge, which rests on theopposite edge of the other plate and leaves an external space to befilled up with solder, said bosses resting on plain parts of the otherplate and serving as distance-pieces, so thata In testimony whereofIhavesigned my name narrow zigzag channel of nearly uniform to thisspecification in the presence of two sub- IO thickness tor the liqulildis forineill between scribingwitnesses. the two p ates of eac pair WliOare con- I 5 nected at the end to said two reservoirs, the TILHELMHOHBACH several pairs touching each other with their Witnesses:projections and forming between them a plu- RICHARD ZAHN, rality ofcross-passages for the cooling-air. ERNST ENTENMANN.

